Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Input/Output Signal Chart
|
Sensor |
Input signal to ECM |
ECM function |
Actuator |
|
Crankshaft position sensor (POS) |
Engine speed *3 Piston position |
Ignition timing control |
Ignition coil (with power transistor) |
|
Camshaft position sensor (PHASE) |
|||
|
Mass air flow sensor |
Amount of intake air |
||
|
Engine coolant temperature sensor |
Engine coolant temperature |
||
|
Throttle position sensor |
Throttle position |
||
|
Accelerator pedal position sensor |
Accelerator pedal position |
||
|
Park/neutral position (PNP) switch *1 |
PNP signal |
||
|
Transmission range switch *2 |
|||
|
Battery |
Battery voltage *3 |
||
|
Knock sensor |
Engine knocking |
||
|
Combination meter |
Vehicle speed *4 |
*1: M/T models
*2: CVT models
*3: ECM determines the start signal status by the signals of engine speed and battery voltage.
*4: This signal is sent to the ECM through CAN communication line.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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